package com.xujinchen.method;

public class Demo07 {
    public static void main(String[] args) {
        System.out.println(f(3));
    }
    //1!
    //5! 5*4*3*2*1
    public static int f(int n){
        if (n==1){
            return  1;

        }else{
            return n*f(n-1);
        }

    }
}
